Import a VR Camera and Sensors for ViveChoose Window->Asset Store Type Steam VR Plugin in the search bar, also select FREE ONLY buttonSelect the Steam VR Plugin (the free one by Valve Corporation)and DownloadChoose ImportChoose Accept All and OK a few times

Put the main view window back to Scene instead of Asset StoreClick the Scene tab on the left

Open the arrow on the SteamVR folder from the Project tabSelect PrefabsDrag the CameraRig into the Hierarchy tabIn the Inspector tab under Steam VR_Play Area change Size to Calibrated, this uses the calibrated area from the headset

Add RigidBodies and colliders to Vive hand held controllersOpen the arrow for CameraRigin the Hierarchy tab choose both of the Controllers

In the Inspector tab: select Add Component -> Physics->RigidBodyTurn off Use Gravity